阅读说明：本技术 一种厨余垃圾热泵干化及mvr浓缩处理装置及工艺 (Kitchen waste heat pump drying and MVR (mechanical vapor recompression) concentration treatment device and process ) 是由 陶求华 罗方芳 于 2021-09-26 设计创作，主要内容包括：本发明公开了一种厨余垃圾热泵干化及MVR浓缩处理装置,包括厨余垃圾热泵低温多效干化系统、垃圾渗滤液蒸汽机械压缩浓缩系统、压榨机和原液池；采用热泵技术进行厨余垃圾低温干化设计,设置显热热回收、一级表冷、二级表冷、一级冷凝、二级冷凝及省能热交换器等多效节能,机组能高效循环,并运用机械蒸汽再压缩(MVR)技术浓缩垃圾渗滤液。相比传统厨余垃圾处理流程,能大幅降低厨余垃圾的含水率,能耗水平明显降低,且能实现清洁排气、排水。本研究成果将提出高效节能、生态环保、经济可行的厨余垃圾综合处理技术,可为厨余垃圾资源化、无害化、稳定化、能源化利用提供方向和实现途径。(The invention discloses a kitchen waste heat pump drying and MVR (mechanical vapor recompression) concentration treatment device, which comprises a kitchen waste heat pump low-temperature multi-effect drying system, a landfill leachate steam mechanical compression concentration system, a squeezer and a stock solution tank, wherein the kitchen waste heat pump low-temperature multi-effect drying system is connected with the squeezer; the low-temperature drying design of the kitchen waste is carried out by adopting a heat pump technology, multiple-effect energy conservation such as sensible heat recovery, primary surface cooling, secondary surface cooling, primary condensation, secondary condensation, an energy-saving heat exchanger and the like is set, the machine set can circulate efficiently, and the garbage percolate is concentrated by utilizing a Mechanical Vapor Recompression (MVR) technology. Compared with the traditional kitchen waste treatment process, the water content of the kitchen waste can be greatly reduced, the energy consumption level is obviously reduced, and clean air exhaust and water drainage can be realized. The research result provides a high-efficiency, energy-saving, ecological, environment-friendly, economic and feasible kitchen waste comprehensive treatment technology, and can provide a direction and an implementation way for the recycling, harmless, stabilizing and energy utilization of the kitchen waste.)

1. A kitchen waste heat pump drying and MVR concentration treatment device is characterized by comprising a kitchen waste heat pump low-temperature multi-effect drying system (1), a landfill leachate steam mechanical compression and concentration system (2), a squeezer (3) and a stock solution tank (4); the stock solution tank (4) is arranged below the squeezer (3) and communicated with the squeezer;

the kitchen waste heat pump low-temperature multi-effect drying system (1) comprises a first conveyor belt (11), a strip extruding machine (12), a heat pump low-temperature multi-effect drying unit (13), a plurality of second conveyor belts (14) and a third conveyor belt (15); one end of the first conveyor belt (11) is arranged at the lower side of one end of the squeezer (3), and the first conveyor belt (11) is obliquely arranged; the strip extruding machine (12) is arranged at the lower side of the other end of the first conveying belt; the heat pump low-temperature multi-effect drying unit (13) is fixedly connected to the lower end of the bar extruding machine (12) and is communicated with the bar extruding machine; the second conveyor belts (14) are uniformly distributed in the heat pump low-temperature multi-effect drying unit (13) from top to bottom; the third conveyor belt (15) is obliquely arranged on the lower side of one end of the second conveyor belt (14) at the lowest end in the heat pump low-temperature multi-effect drying unit (13);

the landfill leachate steam mechanical compression concentration system (2) comprises a preheater (21), a falling film evaporator (22), a separator (23), a steam compressor (24) and a vacuum pump (25); the preheater (21), the falling film evaporator (22) and the separator (23) are sequentially communicated with one end of the stock solution tank, which is far away from the kitchen garbage heat pump low-temperature multi-effect drying system (1), through a feed pipe; one end of the vapor compressor (24) is communicated with the falling film evaporator (22), and the other end of the vapor compressor is communicated with the separator (23) to form a gas loop; the vacuum pump (25) is in communication with the falling film evaporator (22).

2. The kitchen waste heat pump drying and MVR concentration treatment device according to claim 1, further comprising a cooling tower (5), wherein the cooling tower (5) is respectively communicated with the kitchen waste heat pump low-temperature multi-effect drying system (1) and the landfill leachate steam mechanical compression concentration system (2) through a cold condensate water pipeline.

3. The kitchen waste heat pump drying and MVR concentration treatment device according to claim 1, wherein said feeding pipe is provided with a feeding pump (26), one end of which is communicated with said stock solution tank (4), and the other end of which is communicated with said preheater (21).

4. The kitchen waste heat pump drying and MVR concentration treatment device according to claim 1, wherein a discharge pipe is arranged at the lower end of the falling film evaporator (22), and a discharge pump (27) is arranged on the discharge pipe.

5. The kitchen waste heat pump drying and MVR concentration treatment device according to claim 1, wherein the heat pump low temperature multi-effect drying unit (13) is composed of three same unit modules connected in series; each unit module is composed of a heat pump main cycle and a heat pump auxiliary cycle, and the working condition of circulating air of the air drying area is realized together.

6. The kitchen waste heat pump drying and MVR concentration treatment device according to claim 5, wherein the heat pump main cycle consists of 4 high temperature heat pump type scroll compressors (1301), a primary condenser (1302), a secondary condenser (1303), a water-cooled condenser (1304), an energy-saving heat exchanger (1305), a drying filter (1306) and an evaporator (1307) which are communicated in sequence, and forms a circulation loop; the heat pump auxiliary cycle is arranged at a pipeline where the evaporator (1307) is connected with the high-temperature heat pump type scroll compressor (1301).

7. The kitchen waste heat pump drying and MVR concentration treatment device according to claim 6, wherein the heat pump auxiliary cycle is composed of 1 high temperature heat pump type scroll compressor (1310), water-cooled condenser (1304) and precooler (1308) which are connected in sequence, and forms a circulation loop.

8. The kitchen waste heat pump drying and MVR concentration treatment device according to claim 7, wherein an expansion valve is arranged on a pipeline between said drying filter (1306) and said evaporator (1307) in the main cycle of said heat pump, a plate heat exchanger (1309) is arranged between said evaporator (1307) and said primary condenser (1302); an expansion valve is arranged on a pipeline between the water-cooled condenser (1304) and the precooler (1308) in the heat pump auxiliary cycle.

9. A process of the kitchen waste heat pump drying and MVR concentrating device as claimed in any one of claims 1 to 8, comprising the steps of:

1) the kitchen waste is pressed by the presser (3) to generate two parts of products, one of which is garbage percolate flowing into the stock solution tank (4); the second is wet garbage with higher water content;

2) wet garbage with high water content enters the extruding machine (12) through the first conveyor belt (11) to be chopped and extruded and molded, and then is conveyed into the heat pump low-temperature multi-effect drying unit (13) through the second conveyor belt (14) to be dried; finally discharging the dried waste through the third conveyor belt (15);

3) the landfill leachate enters the landfill leachate steam mechanical compression concentration system (2) through the stock solution tank (4) for concentration, and finally condensed water (97-99%) and a small amount of concentrated waste liquid (1-3%) are discharged.

10. The kitchen waste heat pump drying and MVR concentration treatment device according to claim 9, wherein in step 2), when a plurality of second conveyor belts (14) carry kitchen waste to be conveyed in the heat pump unit, a fan blows high-temperature low-humidity circulating air into a closed environment for processing the kitchen waste by using a heat pump principle to dehumidify, and products are condensed water and dried waste (the water content is 10-30%); and in the process of conveying the plurality of second conveying belts (14), a 'cake-shaped' film process is adopted.

Technical Field

The invention relates to the technical field of kitchen waste treatment, in particular to a kitchen waste heat pump drying and MVR (mechanical vapor recompression) concentration treatment device and process.

Background

At present, scientific and technological innovation and ecological environment construction are combined with a good trend of ecological civilization development. In China, people are increasingly conscious of environmental protection, garbage classification is in an execution stage, and a kitchen garbage treatment technology is gradually developed, but the current garbage treatment plant still has the following problems in the kitchen garbage treatment process:

the landfill leachate is a secondary pollutant generated when the municipal refuse landfill is subjected to refuse treatment, and has the characteristics of complex components, high content of organic matters, ammonia nitrogen and heavy metals, stink, unbalanced microbial nutrient elements, extremely high Chemical Oxygen Demand (COD) and Biochemical Oxygen Demand (BOD) concentration and the like, and the harmless treatment of the landfill leachate is always a great problem in the design operation and management of the landfill; at present, the treatment of the percolate mostly adopts the processes of biochemical treatment, reverse osmosis membrane, thermal evaporation and the like, and the energy consumption is higher.

The water content of the kitchen waste is large, and the drying of the kitchen waste is an important link influencing the final effect. Domestic and foreign drying equipment mainly comprises a three-way rotary cylinder dryer, a fluidized bed dryer, a paddle dryer, a disc dryer, a belt dryer, a high-temperature heat pump dryer and the like, and the drying equipment is mainly high in temperature such as high-temperature baking and the like, easy to burn and has a burning explosion risk, and the tail gas treatment difficulty is high; in the drying process, the heat energy loss is overlarge, and the energy utilization rate is low.

Aiming at the problems encountered in the current kitchen waste leachate and kitchen waste drying treatment process, the low-temperature drying design of the kitchen waste is carried out by adopting a heat pump technology in the research, and multiple-effect energy conservation such as sensible heat recovery, primary surface cooling, secondary surface cooling, primary condensation, secondary condensation and energy-saving heat exchangers are arranged, so that the machine set can efficiently circulate, and the Mechanical Vapor Recompression (MVR) technology is used for concentrating the garbage leachate. Compared with the traditional kitchen waste treatment process, the water content of the kitchen waste can be greatly reduced, the energy consumption level is obviously reduced, and clean air exhaust and water drainage can be realized.

Therefore, how to provide a comprehensive kitchen waste treatment technology with high efficiency, energy saving, ecological, environmental protection, economy and feasibility, and a kitchen waste heat pump drying and MVR concentration treatment device and process which can provide direction and realization way for recycling, harmlessness, stabilization and energy utilization of kitchen waste are one of the technical problems to be solved in the field urgently.

Disclosure of Invention

In view of this, the invention provides a kitchen waste heat pump drying and MVR concentration treatment device and process.

In order to solve the technical problems, the invention adopts the following technical scheme:

a kitchen waste heat pump drying and MVR concentration treatment device comprises a kitchen waste heat pump low-temperature multi-effect drying system, a garbage leachate steam mechanical compression concentration system, a squeezer and a stock solution tank; the stock solution tank is arranged below the squeezer and communicated with the squeezer;

the kitchen waste heat pump low-temperature multi-effect drying system comprises a first conveyor belt, a strip extruding machine, a heat pump low-temperature multi-effect drying unit, a plurality of second conveyor belts and a third conveyor belt; one end of the first conveyor belt is arranged at the lower side of one end of the squeezer, and the first conveyor belt is obliquely arranged; the strip extruding machine is arranged on the lower side of the other end of the first conveyor belt; the heat pump low-temperature multi-effect drying unit is fixedly connected to the lower end of the bar extruding machine and is communicated with the bar extruding machine; the second conveyor belts are uniformly distributed in the heat pump low-temperature multi-effect drying unit from top to bottom; the third conveyor belt is obliquely arranged on the lower side of one end of the second conveyor belt at the lowest end in the heat pump low-temperature multi-effect drying unit;

the landfill leachate steam mechanical compression concentration system comprises a preheater, a falling film evaporator, a separator, a steam compressor and a vacuum pump; the preheater, the falling film evaporator and the separator are sequentially communicated with one end of the stock solution tank, which is far away from the kitchen garbage heat pump low-temperature multi-effect drying system, through a feeding pipe; one end of the vapor compressor is communicated with the falling film evaporator, and the other end of the vapor compressor is communicated with the separator to form a gas loop; the vacuum pump is communicated with the falling film evaporator.

Preferably, the system further comprises a cooling tower, and the cooling tower is communicated with the kitchen garbage heat pump low-temperature multi-effect drying system and the landfill leachate steam mechanical compression and concentration system through a cold condensate pipeline.

Preferably, only one feeding pump is arranged on the feeding pipe, one end of the feeding pump is communicated with the stock solution tank, and the other end of the feeding pump is communicated with the preheater.

Preferably, the lower end of the falling-film evaporator is provided with a discharge pipe, and a discharge pump is arranged on the discharge pipe.

Preferably, the heat pump low-temperature multi-effect drying unit is formed by connecting three same unit modules in series; each unit module is composed of a heat pump main cycle and a heat pump auxiliary cycle, and the working condition of circulating air of the air drying area is realized together.

Preferably, the heat pump main cycle consists of 4 high-temperature heat pump type scroll compressors, a primary condenser, a secondary condenser, a water-cooled condenser, an energy-saving heat exchanger, a drying filter and an evaporator which are sequentially communicated, and a circulation loop is formed; the heat pump auxiliary circulation is arranged at a pipeline where the evaporator is connected with the high-temperature heat pump type scroll compressor; namely, the main cycle of the heat pump is that 4 high-temperature heat pump type scroll compressors drive R134a refrigerant to flow through a primary condenser, a secondary condenser and a water-cooled condenser, then flow through a coil pipe in the energy-saving heat exchanger, then pass through an evaporator after being dried and throttled by a drying filter, and then are introduced into the energy-saving heat exchanger again to separate gas and liquid in the energy-saving heat exchanger and then return to the compressor.

Preferably, a fan is further arranged on the second condenser.

Preferably, the heat pump auxiliary cycle consists of 1 normal temperature heat pump type scroll compressor, a water-cooled condenser and a precooler which are sequentially communicated, and forms a circulation loop; namely, the heat pump auxiliary cycle is that 1 normal temperature heat pump type scroll compressor drives the environment-friendly refrigerant to return to the compressor through a water-cooled condenser and a precooler.

Preferably, an expansion valve is arranged on a pipeline between the drying filter and the evaporator in the main cycle of the heat pump, and a plate heat exchanger is arranged between the evaporator and the primary condenser; an expansion valve is arranged on a pipeline between the water-cooled condenser and the precooler in the heat pump auxiliary circulation.

Meanwhile, the invention also provides a process of the kitchen garbage heat pump drying and MVR concentration treatment device, which comprises the following steps:

1) the kitchen waste is pressed by the presser to generate two parts of products, one of which is garbage leachate which flows into the stock solution pool; the second is wet garbage with higher water content;

2) wet garbage with high water content enters the extruding machine through the first conveyor belt to be chopped and extruded and then is conveyed into the heat pump low-temperature multi-effect drying machine set through the second conveyor belt to be dried; finally, discharging the dried garbage through the third conveyor belt;

3) the landfill leachate enters the landfill leachate steam mechanical compression concentration system through the stock solution tank to be concentrated, and finally condensed water (97-99%) and a small amount of concentrated waste liquid (1-3%) are discharged.

Preferably, in the step 2), when the plurality of second conveyor belts carry the kitchen waste to be conveyed in the heat pump unit, by using the heat pump principle, a fan blows high-temperature and low-humidity circulating air into a closed environment for processing the kitchen waste, and dehumidification is performed, wherein the products are condensed water and dried waste (the water content is 10-30%); and in the process of conveying the plurality of second conveying belts, a 'cake-type' film process is adopted.

Compared with the prior art, the invention has the following technical effects:

(1) according to the invention, wet garbage with larger water content is crushed into small blocks by the extruder and extruded to form, and then sent to the heat pump unit by the first conveyor belt for drying treatment. When the second conveying belt carries the kitchen waste to be conveyed in the heat pump unit, the fan blows high-temperature low-humidity circulating air into the closed environment for processing the kitchen waste by utilizing the air conditioning principle to adjust the temperature and humidity of the air, so that the heat and humidity exchange between the kitchen waste and the air can be realized. And in the conveying process of the conveying belt, a pancake type thin film process is adopted, so that the advantage of faster evaporation is achieved. Compared with the traditional dryer, the drying temperature in the heat pump drying unit is low, the drying unit has the advantage of no scorching peculiar smell, tail gas is cleaner, heat energy in the unit is subjected to high-efficiency self-circulation, the utilization rate of the heat energy is improved, energy consumption is reduced under the characteristic of energy conservation of the heat pump unit, and the energy-saving effect is achieved.

(2) By adopting the stock solution tank, the percolate flows into the stock solution tank, and the stock solution tank plays a role in storing and adjusting stock solution, so that the continuous and stable operation of the wastewater evaporation treatment equipment is met; and the landfill leachate steam mechanical compression concentration system is adopted, so that the latent heat of secondary steam is fully utilized, circulating cooling water is eliminated, and the purposes of energy conservation and consumption reduction are achieved.

(3) High efficiency and energy saving. The heat pump refrigeration and heating combined cycle, the low-temperature multi-effect cycle and the high energy efficiency ratio are realized; the MVR energy-saving technology ensures high-efficiency concentration of the unit.

(4) Concentration and drying are performed to realize strong emission reduction.

(5) Harmless emission and clean exhaust. The drying machine has the advantages of low drying temperature, no scorching peculiar smell, and cleaner tail gas due to the arrangement of the bag type middle-effect filter.

(6) And (5) resource utilization. Clean water resources are extracted from the sewage and the wastewater.

Drawings

FIG. 1 is a schematic structural diagram of a kitchen waste heat pump drying and MVR concentration treatment device according to the present invention;

FIG. 2 is a schematic structural diagram of a heat pump low-temperature multi-effect drying unit of a kitchen waste heat pump drying and MVR concentration treatment device according to the present invention;

in the figure: 1. a kitchen waste heat pump low-temperature multi-effect drying system; 11. a first conveyor belt; 12. extruding the strip machine; 13. a heat pump low-temperature multi-effect drying unit; 1301. a high temperature heat pump type scroll compressor; 1302. a first-stage condenser; 1303. a secondary condenser; 1304. a water-cooled condenser; 1305. an energy-saving heat exchanger; 1306. drying the filter; 1307. an evaporator; 1308. a precooler; 1309. a plate heat exchanger; 1310. a normal temperature heat pump type scroll compressor; 14. a second conveyor belt; 15. a third conveyor belt; 2. a landfill leachate steam mechanical compression concentration system; 21. a preheater; 22. a falling film evaporator; 23. a separator; 24. a vapor compressor; 25. a vacuum pump; 26. a feed pump; 27. a discharge pump; 3. a press; 4. a stock solution tank; 5. and (5) cooling the tower.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1-2, the kitchen waste heat pump drying and MVR concentration treatment device comprises a kitchen waste heat pump low-temperature multi-effect drying system 1, a landfill leachate steam mechanical compression concentration system 2, a squeezer 3 and a stock solution tank 4; the stock solution tank 4 is arranged below the squeezer 3 and communicated with the squeezer;

the kitchen waste heat pump low-temperature multi-effect drying system 1 comprises a first conveyor belt 11, a strip extruding machine 12, a heat pump low-temperature multi-effect drying unit 13, a plurality of second conveyor belts 14 and a third conveyor belt 15; one end of the first conveyor belt 11 is arranged at the lower side of one end of the presser 3, and the first conveyor belt 11 is arranged obliquely; the extruder 12 is arranged at the lower side of the other end of the first conveyor belt; the heat pump low-temperature multi-effect drying unit 13 is fixedly connected to the lower end of the rod extruding machine 12 and is communicated with the rod extruding machine; the second conveyor belts 14 are uniformly distributed in the heat pump low-temperature multi-effect drying unit 13 from top to bottom; the third conveyor belt 15 is obliquely arranged at the lower side of one end of the second conveyor belt 14 at the lowest end in the heat pump low-temperature multi-effect drying unit 13;

the landfill leachate steam mechanical compression concentration system 2 comprises a preheater 21, a falling film evaporator 22, a separator 23, a steam compressor 24 and a vacuum pump 25; the preheater 21, the falling film evaporator 22 and the separator 23 are sequentially communicated with one end of the stock solution tank, which is far away from the kitchen garbage heat pump low-temperature multi-effect drying system 1, through a feeding pipe; one end of the vapor compressor 24 is communicated with the falling film evaporator 22, and the other end is communicated with the separator 23 to form a gas loop; the vacuum pump 25 is communicated with the falling film evaporator 22; the feed pipe is also provided with a feed pump 26, one end of the feed pump is communicated with the stock solution tank 4, and the other end of the feed pump is communicated with the preheater 21; the lower end of the falling-film evaporator 22 is provided with a discharge pipe, and a discharge pump 27 is arranged on the discharge pipe.

Still include cooling tower 5, cooling tower 5 respectively through the cold condensate water pipeline with kitchen garbage heat pump low temperature multiple-effect mummification system 1 with landfill leachate steam machinery compression concentration system 2 intercommunication.

In this embodiment, the heat pump low-temperature multi-effect drying unit 13 is formed by connecting three identical unit modules in series; each unit module is composed of a heat pump main cycle and a heat pump auxiliary cycle, and the working condition of circulating air of the air drying area is realized together.

In this embodiment, the heat pump main cycle is composed of 4 high-temperature heat pump type scroll compressors 1301, a primary condenser 1302, a secondary condenser 1303, a water-cooled condenser 1304, an energy-saving heat exchanger 1305, a dry filter 1306, and an evaporator 1307, which are connected in sequence, and forms a circulation loop; the heat pump auxiliary cycle is provided at a pipe where the evaporator 1307 is connected to the high temperature heat pump type scroll compressor 1301.

In this embodiment, the heat pump auxiliary cycle is composed of 1 normal temperature heat pump type scroll compressor 1310, a water-cooled condenser 1304, and a precooler 1308, which are sequentially connected, and forms a circulation loop.

In this embodiment, an expansion valve is disposed on a pipeline between the dry filter 1306 and the evaporator 1307 in the main cycle of the heat pump, and a plate heat exchanger 1309 is disposed between the evaporator 1307 and the primary condenser 1302; an expansion valve is arranged on a pipeline between the water-cooled condenser 1304 and the precooler 1308 in the heat pump auxiliary cycle.

In this embodiment, the compressor is a CTYZ-200 screw press, the power is 5.5kW, and the external dimension: 2850X 700X 1500 mm.

In this embodiment, the high-temperature heat pump type scroll compressor is a YSW290J1G-100 high-temperature heat pump type compressor, and the normal-temperature heat pump type scroll compressor is a YSW400A1G-100 normal-temperature heat pump type compressor.

In the embodiment, the GNDD5000YL1 is selected as the precooling coil, and the refrigerating capacity is 160 kW; the water-cooled condenser adopts RC75-2, and the heating capacity is 198.4 kW; the first-stage evaporator adopts GNDD5000ZF1, and the refrigerating capacity is 200.1 kW; the secondary evaporator adopts GNDD5000ZF2, and has refrigeration capacity of 170.7 kW; the first-stage condenser is GNDD5000LN1, and the heating capacity is 354 kW; three secondary condensers GNDD5000LN2 with the heating capacity of 178 kW; the external condenser is selected from RC75-2, 210 kW; the cooling tower is selected to be LBCM-P-65 type cooling tower.

In this embodiment, the type of the heat exchange chamber of the falling film evaporator is selected: heat exchange area: square meter 20, cylinder specification: phi 600mm, heat exchange tube specification: phi 22 multiplied by 3000mm, heat exchange tube material: 316L, shell side material: carbon steel.

In the embodiment, the separator is selected from the following types: phi 900mmH 1500mm, material: 316L.

In this example, the vapor compressor is of the type: suction port pressure: 0.08MPa (95 ℃), suction inlet flow: 12m³Min, outlet pressure: 1.11MPa (106 ℃ C.), compression ratio: 1.375, rotation speed: frequency conversion, power: 7.0kW, impeller material: titanium alloy, volute material: SUS 316L.

In this embodiment, the discharge pump is selected: flow rate: 0.28m³H, lift: 10m, rotating speed: 2960r/min, power: 0.9kW, flow-through components: SUS304, matched dynamic water-cooling seal, and pipeline connection size: 20 mm.

In this embodiment, the preheater is of the type: the heat transfer area is 6 square meters, the model is: BR0.10 plate heat exchanger.

In this embodiment, the vacuum pump is selected: the size of the connecting pipe is as follows: 20mm, power: 0.18 kW.

In this example, the feed pump was type-selected: specification: IH 50-32-160, flow: 0.28m³H, lift: 10m, rotating speed: 2960r/min, power: 0.9kW, flow-through components: SUS304, matched dynamic water-cooling seal, and pipeline connection size: 20 mm.

In this embodiment, the energy-saving heat exchanger is selected to be an SRAH-721 type energy-saving heat exchanger.

The treatment process of the kitchen waste heat pump low-temperature multi-effect drying system comprises the following steps: kitchen garbage with the water content of 90% is fed from a squeezer 3, is subjected to first-step mechanical crushing, extrusion dehydration and then is discharged, is conveyed to a strip extruding machine 12 by a first conveyor belt 11 to be extruded into a noodle shape, then enters an air drying area of a heat pump low-temperature multi-effect drying machine set, is subjected to heat and humidity exchange with circulating air blown out by a condenser, and is discharged to obtain dried garbage with the water content of 20%.

The treatment process of the landfill leachate steam mechanical compression concentration system is as follows: after the raw material liquid is preheated by the preheater 21, the raw material liquid enters a tube pass of the falling film evaporator 22, low-temperature secondary steam generated after the raw material liquid is heated and evaporated in the falling film evaporator 22 enters a steam compressor 24 through a separator 23, a concentrated liquid is discharged by a discharge pump 27, the secondary steam after the heat is raised and the pressure is raised in the steam compressor 24 to improve the enthalpy enters a shell pass of the evaporator, after the heat is exchanged with the raw material liquid, the condensed liquid is discharged out of the falling film evaporator 22, and the condensed liquid enters the preheater 21 to be preheated and is discharged as condensed water after the heat is released from the raw material liquid. The system fully utilizes the latent heat of the secondary steam and cancels circulating cooling water, thereby realizing the purposes of energy conservation and consumption reduction

In other embodiments, the invention further provides a process of the kitchen waste heat pump drying and MVR concentration treatment device, which comprises the following steps:

1) the kitchen waste is pressed by the presser 3 to generate two parts of products, one of which is garbage percolate flowing into the stock solution tank 4; the second is wet garbage with higher water content;

2) wet garbage with high water content enters the extruding machine 12 through the first conveyor belt 11 for chopping and extrusion forming, and then is conveyed into the heat pump low-temperature multi-effect drying unit 13 through the second conveyor belt 14 for drying treatment; finally, discharging the dried waste through the third conveyor belt 15;

3) the landfill leachate enters the landfill leachate steam mechanical compression concentration system 2 through the stock solution tank 4 to be concentrated, and finally condensed water (97-99%) and a small amount of concentrated waste liquid (1-3%) are discharged.

In the embodiment, in the step 2), when the plurality of second conveyor belts are used for conveying 14 kitchen garbage carried by the second conveyor belts in the heat pump unit, a fan blows high-temperature and low-humidity circulating air into a closed environment for processing the kitchen garbage by using a heat pump principle to perform dehumidification, and the products are condensed water and the water content of dried garbage (10-30%); and a 'cake-like' film process is adopted in the process of conveying a plurality of second conveying belts 14.

Compared with the prior art, the invention has the following technical effects:

(1) according to the invention, wet garbage with larger water content is crushed into small blocks by the extruder and extruded to form, and then sent to the heat pump unit by the first conveyor belt for drying treatment. When the second conveying belt carries the kitchen waste to be conveyed in the heat pump unit, the fan blows high-temperature low-humidity circulating air into the closed environment for processing the kitchen waste by utilizing the air conditioning principle to adjust the temperature and humidity of the air, so that the heat and humidity exchange between the kitchen waste and the air can be realized. And in the conveying process of the conveying belt, a pancake type thin film process is adopted, so that the advantage of faster evaporation is achieved. Compared with the traditional dryer, the drying temperature in the heat pump drying unit is low, the drying unit has the advantage of no scorching peculiar smell, tail gas is cleaner, heat energy in the unit is subjected to high-efficiency self-circulation, the utilization rate of the heat energy is improved, energy consumption is reduced under the characteristic of energy conservation of the heat pump unit, and the energy-saving effect is achieved.

(2) By adopting the stock solution tank, the percolate flows into the stock solution tank, and the stock solution tank plays a role in storing and adjusting stock solution, so that the continuous and stable operation of the wastewater evaporation treatment equipment is met; and the landfill leachate steam mechanical compression concentration system is adopted, so that the latent heat of secondary steam is fully utilized, circulating cooling water is eliminated, and the purposes of energy conservation and consumption reduction are achieved.

(3) High efficiency and energy saving. The heat pump refrigeration and heating combined cycle, the low-temperature multi-effect cycle and the high energy efficiency ratio are realized; the MVR energy-saving technology ensures high-efficiency concentration of the unit.

(4) Concentration and drying are performed to realize strong emission reduction.

(5) Harmless emission and clean exhaust. The drying machine has the advantages of low drying temperature, no scorching peculiar smell, and cleaner tail gas due to the arrangement of the bag type middle-effect filter.

And (5) resource utilization. Clean water resources are extracted from the sewage and the wastewater.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.